THE LEGUMES. 89 



PROBLEMS. 



1. If there are on an average 60 seeds of alfalfa per square foot on 

 a field when we sow 10 pounds of seed per acre, how many seeds are 

 there in a bushel of alfalfa? 



2. How many bushels will be required to seed 20 acres using 15 

 pounds per acre, and how many seeds will there be on an average per 

 square foot? 



3. What will be the cost of seeding 5 acres, using 8 pounds of seed 

 per acre when seed is selling at $12 per bushel? 



4. If there are 35 pounds of nitrogen in one ton of alfalfa hay and 

 an acre of land produces 1.5 tons of hay, and two-thirds of the notrogen 

 in an alfalfa plant is in the roots, what is the value of the nitrogen left 

 in a 5 acre field after the hay crop has been removed, basing the calcula- 

 tion on the present price of nitrogen, at 15c a pound? 



5. An acre of alfalfa produced 4 tons of hay in one season; 60 per 

 cent of the hay was stem, 40 per cent was leaves ; 40 per cent of the protein 

 was in the stem and 60 per cent of. the protein was in the leaves, which is 

 the most valuable part of the hay? Why should we be careful to save 

 the leaves? 



6. In the four tons of hay given in problem 5, 20 per cent of the 

 fat was in stems, and the percentage of fat in the leaves was 80, how many 

 pounds of fat were there in each the leaves and the stems in the four 

 tons? (See table page 85.) 



7. If we should lose half of the leaves in making a hay crop that 

 yields 1 ton per acre, how many pounds each of protein and fat would 

 be lost? 



RELATION OF VALUE OF LEAVES TO STEMS. 



Quantity 



In Stem 60 per cent 



In Leaves 40 per cent 



Protein 



In Stem 40 per cent 



In Leaves 60 per cent 



Fat 



In Stem 20 per cent 



In Leaves 80 per cent 



8. Find the number of pounds of the following feeds that will have 

 the equivalent in digestible protein of 1 ton of alfalfa, if the percentage 

 is as follows : 



